Hi..Zimbra has a nice small doc
http://www.zimbra.com/pdf/Zimbra%20Quick%20Start.pdf
iam tying to write 2 docs
1) FC3 for New users
2) Zimbra for New Users
kind of very simple detailed doc as a STEP by STEP per CLICK starting point..will update this fourm once done..some time soon
Raj S Vrach